dotnet format does not use custom .editorconfig in 9.0.301

[Gsantomaggio]

Describe the bug

The command dotnet format does not work correctly in > 9.0.301

dotnet format xxx --no-restore --verify-no-changes

It appears that it no longer uses the .editorconfig file.

We have projects with dotnet build 8.0x, 9.x. They worked fine until the last versions

See, for example:
https://github.com/rabbitmq/rabbitmq-amqp-dotnet-client/actions/runs/15584250952

✅ Ubuntu uses 8.0
🚫 Windows uses 9.0.300 ( it worked with 9.0.202 )

To Reproduce

Exceptions (if any)

It worked on my Mac with 9.0.202, but now with 9.0.301, it no longer works.

Further technical details

.NET SDK:
 Version:           9.0.301
 Commit:            a596cd22e2
 Workload version:  9.0.300-manifests.9bcbba73
 MSBuild version:   17.14.5+edd3bbf37

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  15.5
 OS Platform: Darwin
 RID:         osx-arm64
 Base Path:   /usr/local/share/dotnet/sdk/9.0.301/

.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.6
  Architecture: arm64
  Commit:       3875b54e7b

.NET SDKs installed:
  8.0.201 [/usr/local/share/dotnet/sdk]
  9.0.202 [/usr/local/share/dotnet/sdk]
  9.0.301 [/usr/local/share/dotnet/sdk]

So, same error in the Ci and Mac locally.

dotnet format rabbitmq-amqp-dotnet-client.sln --no-restore --verify-no-changes 
/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/IBackoffDelayPolicy.cs(40,27): error IDE1006: Naming rule violation: Missing prefix: 's_' [/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/RabbitMQ.AMQP.Client.csproj]
/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/IBackoffDelayPolicy.cs(41,27): error IDE1006: Naming rule violation: Missing prefix: 's_' [/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/RabbitMQ.AMQP.Client.csproj]
/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/Impl/AmqpManagement.cs(34,30): error IDE1006: Naming rule violation: Missing prefix: 's_' [/a/rabbitmq-amqp-dotnet-client/RabbitMQ.AMQP.Client/RabbitMQ.AMQP.Client.csproj]

it seems that it ignores .editorconfig

thank you